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Property, plant and equipment - Depreciation ranges (Details)
12 Months Ended
Jun. 30, 2018
Minimum | Buildings and improvements  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 1.00%
Minimum | Retail convenience centres  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 3.00%
Minimum | Plant  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 2.00%
Minimum | Equipment  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 3.00%
Minimum | Vehicles  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 5.00%
Maximum | Buildings and improvements  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 17.00%
Maximum | Retail convenience centres  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 5.00%
Maximum | Plant  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 50.00%
Maximum | Equipment  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 67.00%
Maximum | Vehicles  
Property, plant and equipment  
Depreciation Rate, Property Plant And Equipment 33.00%